regex101: sources.list line match

Group type(?P<type>deb(?:-src)?)

debthe literal text deb (case sensitive)

Non-Capturing Group(?:-src)?

?repeats the group contents below at most once:

-srcthe literal text -src (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:\[(?P<options>.*)\] )?

?repeats the group contents below at most once:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group options(?P<options>.*)

.*any Unicode character (except for line terminators), repeated any number of times

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group uri(?P<uri>(?P<protocol>(?:(?:mirror\+)?(?P<local>file|cdrom|copy)|(?P<remote>http|https|ftp|ssh))):(?(remote)//((?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,6}))/[a-zA-Z0-1-_\./]+)

1st Alternative(?:mirror\+)?(?P<local>file|cdrom|copy)

Non-Capturing Group(?:mirror\+)?

?repeats the group contents below at most once:

mirrorthe literal text mirror (case sensitive)

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Group local(?P<local>file|cdrom|copy)

1st Alternativefile

filethe literal text file (case sensitive)

2nd Alternativecdrom

cdromthe literal text cdrom (case sensitive)

3rd Alternativecopy

copythe literal text copy (case sensitive)

2nd Alternative(?P<remote>http|https|ftp|ssh)

Group remote(?P<remote>http|https|ftp|ssh)

1st Alternativehttp

httpthe literal text http (case sensitive)

2nd Alternativehttps

httpsthe literal text https (case sensitive)

3rd Alternativeftp

ftpthe literal text ftp (case sensitive)

4th Alternativessh

sshthe literal text ssh (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Condition(?(remote)//((?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,6}))

Uses the first branch if group remote matched

If the condition is true, match this branch://((?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,6})

//the literal text //

Group 7((?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,6})

Non-Capturing Group(?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+

+repeats the group contents below at least once:

Negative Lookahead(?!-)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-zA-Z0-9-]{1,63}

{1,63}matches between 1 and 63 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookbehind(?<!-)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-zA-Z]{2,6}

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[a-zA-Z0-1-_\./]+

the literal (32₁₀ / 40₈ / 20₁₆)

Group suite(?P<suite>[a-z/]+)

Non-Capturing Group(?:(?<!/) (?P<components>[a-z]+(?: [a-z]+)*))

Global pattern flags

u modifier: unicode. Makes \w, \W, \b, \B, \d, \D, \s, and \S use Unicode semantics (redundant in Python 3)

Search reference

Regular Expression

(?P<type>deb(?:-src)?) (?:\[(?P<options>.*)\] )?(?P<uri>(?P<protocol>(?:(?:mirror\+)?(?P<local>file|cdrom|copy)|(?P<remote>http|https|ftp|ssh))):(?(remote)//((?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,6}))/[a-zA-Z0-1-_\./]+) (?P<suite>[a-z/]+)(?:(?<!/) (?P<components>[a-z]+(?: [a-z]+)*))

Unit Tests

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